mecha
Well-known member
well, as a continuation of the same issue I had last year, I still have a Defender that plays the wrong sounds during gameplay. I have an assortment of new intel for this experiment of mine, so hold tight:
I will label parts as #1 (what came with the game) and #2 (what I bought extra)
sound board #2 has the [speech?] expansion slot, so I'm guessing that means it's a newer version?
this machine has a switching power supply installed with the old style RAM. the original power supply connector was not cut but instead was fitted with an adapter. I DO have an original Defender power supply that I bought along with a Bob Robert's repair kit, after reading that the Stargate one is the more desirable... I have not tested any voltages besides the +5, which I cannot remember where it's at because this has been an on-off again project for a year now.
1) I purchased a complete additional boardset. the CPU board boots up fine, the ROM board worked, however, had an assortment of roms installed that were in various shit conditions (missing pins/corrosion/etc.) so I wound up mixing and matching what I felt were the better looking roms between my 2 boards into one (potentially a mistake?)
2) sound board #1 would not work with all the #2 boards. in fact, the game would flash a green screen and have a white pattern screen, same condition as when the ROM board is unplugged from the CPU board. I used sound board #2 and the game booted, albeit playing incorrect sounds.
it should be worth noting I don't know what the Sound Test sound sounds like, if anyone has audio or video of this, please share it.
3) swapped back all known working roms to ROM board #1, sound board #1 now works. it plays entirely different sounds from sound board #2 that are also incorrect. swapped both socketed chips on the sound boards, same exact results.
4) I don't remember what condition changed when I did this, but I noticed that both sound boards had different dipswitches, and one board had both set to On and the other was set to Open (meaning off, yes?), I flipped the better working sound board #2 to whatever other option they were and I can't remember if there was a change or not.
5) to echo a previous thread of mine, I have swapped sound roms between the two boards with no change. refer to #1, did mixing my game roms cause this? they're both red label types dated 1981, with a few that have white labels dated 1980 (probably ones that didn't get changed between revisions?).
I don't have this game at my house or anything, it's at work, and I'm home now so I don't know what the dipswitch arrangements were. lol
questions I have:
-what do the dipswitches do, and what should they be set at?
-what do I need to make a new Test Panel for this? whoever had it last completely removed the test panel and cut all the wiring going to the coin door. I'm a little tired of having to hotwire it to get it out of the bookkeeping mode.
-which chip exactly is the PIA chip? I remember there being 2 chips that have to match or else it won't work right. I don't work with this game at all, so I don't know what all the exact parts are, I'm not a know-it-all, and I want anyone that replies to assume that I don't know anything about this game at all and will need some direction to make it work.
thank you.
I will label parts as #1 (what came with the game) and #2 (what I bought extra)
sound board #2 has the [speech?] expansion slot, so I'm guessing that means it's a newer version?
this machine has a switching power supply installed with the old style RAM. the original power supply connector was not cut but instead was fitted with an adapter. I DO have an original Defender power supply that I bought along with a Bob Robert's repair kit, after reading that the Stargate one is the more desirable... I have not tested any voltages besides the +5, which I cannot remember where it's at because this has been an on-off again project for a year now.
1) I purchased a complete additional boardset. the CPU board boots up fine, the ROM board worked, however, had an assortment of roms installed that were in various shit conditions (missing pins/corrosion/etc.) so I wound up mixing and matching what I felt were the better looking roms between my 2 boards into one (potentially a mistake?)
2) sound board #1 would not work with all the #2 boards. in fact, the game would flash a green screen and have a white pattern screen, same condition as when the ROM board is unplugged from the CPU board. I used sound board #2 and the game booted, albeit playing incorrect sounds.
it should be worth noting I don't know what the Sound Test sound sounds like, if anyone has audio or video of this, please share it.
3) swapped back all known working roms to ROM board #1, sound board #1 now works. it plays entirely different sounds from sound board #2 that are also incorrect. swapped both socketed chips on the sound boards, same exact results.
4) I don't remember what condition changed when I did this, but I noticed that both sound boards had different dipswitches, and one board had both set to On and the other was set to Open (meaning off, yes?), I flipped the better working sound board #2 to whatever other option they were and I can't remember if there was a change or not.
5) to echo a previous thread of mine, I have swapped sound roms between the two boards with no change. refer to #1, did mixing my game roms cause this? they're both red label types dated 1981, with a few that have white labels dated 1980 (probably ones that didn't get changed between revisions?).
I don't have this game at my house or anything, it's at work, and I'm home now so I don't know what the dipswitch arrangements were. lol
questions I have:
-what do the dipswitches do, and what should they be set at?
-what do I need to make a new Test Panel for this? whoever had it last completely removed the test panel and cut all the wiring going to the coin door. I'm a little tired of having to hotwire it to get it out of the bookkeeping mode.
-which chip exactly is the PIA chip? I remember there being 2 chips that have to match or else it won't work right. I don't work with this game at all, so I don't know what all the exact parts are, I'm not a know-it-all, and I want anyone that replies to assume that I don't know anything about this game at all and will need some direction to make it work.
thank you.
Last edited:
